Electric Blimp?

[Combwork]

Originally Posted by BlueStreak

The idea has been bandied about in recent times. It usually comes down to speed.
30 mph or 600 mph? Makes a huge difference when travelling 3,000 miles. Besides our effed up politics, it's the same problem that dogs rail travel in the US. It would save huge amounts of fuel, have near-zero emissions and provide a pleasant, interesting travel experience flying low and slow so you can see the pretty scenery. But, here in America it would get zero support.

I can hear it now;

"F**k that stupid balloon. If I want to fly, I'll take a jet and be there in 1/20th the time." Then they'd make some ignorant sarcastic comment about how only "prissy Marxist Europeans fly in balloons", or some such idiotic nonsense.

Regards,
Dave

I wonder how much R & D it would need to get something with the ability to carry say, 100 people (including crew) past safety requirements into the air. The Hindenburg had very heavy diesel engines, had to carry fuel for the engines plus food for passengers and crew. Apart from the initial purchase cost of photo-voltaic cells and their design life, running costs would be low. If tourists are happy to travel through the Rockies behind a steam locomotive, would they pay significantly more than that to look at the mountains from above?

The idea behind the doughnut design was that no matter what direction the wind came from, if the top surface had the same profile as the wing on a plane it would lift. There could be a slight problem in that the ring having a wing profile over 360 degrees means that the wind flowing over and lifting the wing at the 'front' would flow over and hit the wing at the 'back' which due to it having the reverse profile to the one at the 'front' could push it downwards.

The problem with 'simple' ideas is trying to make the bloody things work. The Victorians had the right approach. "You want to build it? fair enough. If it kills you, fair enough. If it kills bystanders, also fair enough; they shouldn't have been standing so close. Well, apart from one or two bits and pieces I guess they're not close anymore"

[Boreas]

Originally Posted by Combwork

I wonder how much R & D it would need to get something with the ability to carry say, 100 people (including crew) past safety requirements into the air. The Hindenburg had very heavy diesel engines, had to carry fuel for the engines plus food for passengers and crew.

I don't see a significant difference between the weight of conventional fossil fuel engines and the powerful electric motors a PV LTA (don't you love acronyms?) would need. No weight of fuel to consider, of course, but there are batteries to consider. Need a lot of those to fly through the night.

Then there's the amount of generation required for charging all those batteries versus the amount required on-demand for propulsion. These things have been dealt with on manned and unmanned solar-powered HTA aircraft but, at least at present, these things are very, very slow.

John

[BlueStreak]

Oh, I agree and think it's a wonderful idea. It would definitely be a niche market (Tourism-sightseeing), and I think it would be cool.

As for your comments about the "donut", I believe you're right. I think there ahs already been research into the donut shaped airfoil and it doesn't work very well. Not as an HTA design, anyways, and for the very reason you describe. At the trail edge of a standard airfoil is a natural down draft. In standard HTA aircraft design, there is a troublesome effect called "shadowing". If the horizontal plane of two airfoils is not offset, relative to the airstream, the leading foil will "shadow" the trailing foil with turbulent air, leading to a significant loss of lift and control problems.

In an LTA design, it may be somewhat different as the foil generates lift, even when static, and the speeds are generally lower.

Regards,
Dave

[BlueStreak]

Originally Posted by Boreas

I don't see a significant difference between the weight of conventional fossil fuel engines and the powerful electric motors a PV LTA (don't you love acronyms?) would need. No weight of fuel to consider, of course, but there are batteries to consider. Need a lot of those to fly through the night.

Then there's the amount of generation required for charging all those batteries versus the amount required on-demand for propulsion. These things have been dealt with on manned and unmanned solar-powered HTA aircraft but, at least at present, these things are very, very slow.

John

+1.

Dave

[merrylander]

I came across this photo this morning so I scanned it in. A picture my Dad must have taken and that is probably my Mom and older siblings in the picture. That was August 1930 so I am also in the picture as I was born that December.

Taken at the airbase at St. Hubert, Quebec when the R-100 visited Canada.

[piece-itpete]

That's very cool Rob.

Originally Posted by merrylander

.. Being somewhere at 4:00 AM is uncivilized.

I agree 100%.

Pete